Square footage of rooms
Marriott and Starwood (and perhaps others) are very forthright about the sizes of their rooms on their websites...either I'm missing the trick to finding the information with Hilton, as I have to always call to find out.
To me the amount of personal space is very important. Is there someplace on the Hilton hotel websites that has this information that I just don't know about?
Also...when was the hotel built, when was it last renovated - Marriott is especially good about this.